Mathematics waec 2016

In the diagram MN is a chord of a circle KMN centre O and radius 10cm. If < MON = 140o, find, correct to the nearest cm, the length of the chord MN.

a

19cm

b

18cm

c

17cm

d

12cm

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Correct Option
a

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Discussions (3)

rachigod
1 year ago

Why wasn't cosine rule used?

rachigod
1 year ago

I mean using cosine rule so that we don't need to split the triangle into half we just use
A^2=B^2 +C^2 -2BC cos a

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